Incinerator



Aug. 29, 1967 D P FRANKEL ETAL 3,338,191

INCINEATOR 4 Sheets-Sheet 1 Filed May 2l, 1964 Aug. 29, l 967 D. P. FRANKEL. ET AL INCINERATOR 4 Sheets-Sheet 2 Filed May 2l, 1964 Aug. 29, 1967 D. P. FRANKEL ET AL 3,33391 INCINERATOR 4 Sheets-Sheet 3 Filed May 2l, 1964 Aug. 29, 1967 D. P` FRANKEL ET AL 3,333,19

INCINERATOR 4 Sheets-Sheet 4 Filed May 2l, 1964 United States Patent Oilce 3,338,191 Patented Aug. 29, 1967 3,338,191 INCINERATOR Donald P. Frankel, Lake Geneva, and Maurice E. Christenson, Walworth, Wis., assignors to La Mere Industries, Inc., a corporation of Delaware Filed May 21, 1964, Ser. No. 369,056 25 Claims. (Cl. 1109) 'Ihis invention relates to devices in which burning and cooling cycles are utilized, e.g., for purposes of sterilizing materials, destroying Waste products, etc. More particularly this invention relates to the control of air ilow in such a device during a burning cycle and a consecutive or subsequent cooling cycle.

Devices such as dry latrines, sterilizers, and other heating or burning devices, are often operated through a plurality of cycles, such as a timed burning or heating cycle and a subsequent or consecutive timed cooling cycle. Where the device is a sterilizer or a dry latrine, it will usually include a receptacle having' an inlet and an openable and closable cover on the inlet, and the receptacle is heated during the heating or burning cycle and thereafter cooled during the cooling cycle. In the case of the sterilizer, the receptacle may be heated by an exterior burner, and materials placed in the receptacle through the inlet may be sterilized by heat exchange with the burner through the receptacle walls. In such case, the combustion chamber is separate from the reeeptacle. Where the device is a dry latrine, the burner is usually disposed within the latrine in a lower portion of the receptacle or bowl, commonly known as the firepot. In such case, the flrepot constitutes the combustion chamber which is within the waste products receptacle so that the vburner may be trained upon the waste proclucts for destroying the same.

During the burning cycle, the burner is used to obtain the desired heat for the desired purpose, and during the cooling cycle a volume of air is circulated through the com-bustion chamber and exhausted therefrom, e.g., using the combustion gas exhaust system for exhausting to cool the combustion chamber and the receptacle. The blower or other means for impelling air through the combustion chamber during the cooling cycle may also be used for supplying combustion air to the burner during the burning cycle.

However, in such systems using the burning cycle and cooling cycle, the optimum combustion conditions for heating the receptacle to high temperatures are different from the optimum cooling conditions. Too much air ow through the combustion chamber during the 'burning cycle inhibits the complete burning of odors or odor components in the combustion chamber. Too little air llowing during the cooling cycle is not conducive to good cooling. Therefore, it has been a practice to provide designs in which some intermediate air flow rate is achieved.

It is the general object of this invention to provide a new and useful device of the character described.

More particularly, it is the object of this invention to provide such a device in which the duration of burning and cooling cycles may be reduced by regulating air flow conditions.

Further, it is the object of this invention to provide such a device in which an air flow is used during both burning and cooling cycles and the air ilow path through a combustion chamber or the re pot is controlled for a low rate of ow during the burning cycle; it is another object to provide such a system in which cooling is improved during the cooling cycle, e.g. by controlling the ow path for a high rate of flow through the re pot and/or by providing good cooling flow around the lire pot.

- It is also the object of this invention to provide a device including a combustion chamber in which heat is retained during burning by a restricted exhaust system to provide temperatures suicient to burn odors and increase the burning rate of waste products and in which good cooling can also be provided by permitting full ilow of cooling air through the exhaust during the cooling cycle.

A further object of this invention is to provide a device in accordance with any of the foregoing objects which includes a control system for cycling the device through timed heating and cooling cycles responsive to operation of the device and which may include an override system for altering, cancelling, or resetting the cycles of operation.

Another object is to provide a new and useful control system for a dry latrine or the like by which a burning cycle and subsequent cooling cycle are established.

Another object of this invention is to provide a dry latrine in accordance with any of the foregoing objects and wherein air flow is provided through the tire-pot portion of the latrine bowl, with control of air flow during the burning cycle to restrict the burning rate and assure more complete burning of odors and the like.

Still another object of this invention is to provide a dry latrine device in accordance with any of the foregoing objects in which a cooling and exhausting cycle is provided during use of the latrine for removal of volatiles prior to initiation of a burning cycle, thereby decreasing flashing tendencies upon ignition of the burner and preventing momentry and damaging increases in ue temperature due to such flashing.

Yet another object is to provide a device in accordance with any of the foregoing objects in which the exit of smoke, steam and gas from the bowl inlet is inhibited by direction of air through the inlet into the bowl during the burning cycle.

Another object is to provide a new and useful insulating trap door for use in a dry latrine; still other objects include the provision of anew and useful trap door drive system responsive to opening a dry latrine cover and adapted to also drive a timer to set a predetermined time interval for control of burning and cooling operations, as well as the provision of a new and useful controllable valving system for regulating air How in a device of the character described.

Other objects of this invention will be apparent from the following description and the drawings in which:

FIGURE 1 is a vertical section through a dry latrine along line 1-1 of FIGURE 3, illustrating an embodiment of the present invention;

FIGURE 2 is a section generally along line 2-2 of FIGURES 1 and 3;

FIGURE 3 is a section along line 3 3 of FIGURE 1;

FIGURE 4 is a Wiring diagram illustrating a form of wiring for a conrol system usable with the dry latrine of FIGURES 1-3; and

FIGURE 5 is a fragmentary section of another or modied form of device along the same section line as FIGURE 3 and showing portions which differ from the form of device of FIGURE 3.

While this invention is susceptable of embodiment in many different forms, thereV is shown in the drawings and will herein be described in detail a specic embodiment and modification thereof, with the understanding that the present disclosure is to be considered as an exempliication of the principles of the invention and is not intended to limit the invention to the embodiment or modification illustrated.

In FIGURES 1-3, there is illustrated a dry latrine structure, the elements of which will be identied here to the extent deemed necessary for understanding the present invention. Reference may be made by those in the art to other latrine structures, e.g. the latrine structure described in copending application of Donald P. Frankel, Ser. No. 278,015, entitled, Latrine or Toilet Apparatus, filed May 6, 1963, and details of such other structures may be used as desired in the present dry latrine.

The form of dry latrine illustrated is one in which a receptacle, in the form of a bowl 11, is defined generally by a fire pot or combustion chamber bottom wall 12 and sheet metal walls 13 upstanding therefrom. Bottom wall 12 is surrounded by suitable insulation 14, support plate 15 at the front end, and a flange 16 at the rear end of wall 12. The latrine includes an outer casing wall structure 18, generally of hexahedral configuration. Flange 16 and upstanding plate 15 are secured to side and bottom walls, respectively, of casing 18.

The fire pot or combustion chamber portion of bowl 11 is identified by reference numeral 17 and includes an outlet chamber portion 19 which communicates exteriorly of the fire pot through a port 22 in an inwardly projecting top portion 12a of wall 12 and in ange 16.

A burner nozzle 23 is mounted through wall 13 for directing a flame into re pot 17. Nozzle 23 lies against bottom wall 12 and is equipped with an igniter 24. A burner protecting plate 25, secured at one edge to wall 13, is provided over the burner and extending beyond the nozzle end to protect the burner from materials being deposited in bowl 11. Burner 23 is supplied through an air and fuel supply line in the form of conduit 26 which directs a mixture of air `and gas from a mixer in the form of a pressure blower or pressurizer 27, driven by motor 28. Motor 28 also drives an exhaust blower 29. Pressurizer 27 is supplied with gas through gas supply line 31 provided with a solenoid control valve 32 of the on-off type so that the supply of gas through line 31 can be shut off. Pressurizer 27 draws in air from its environment and charges air through conduit 26 and burner 23 during both burning and cooling cycles.

During the burning cycle, valve 32 is open and the air-gas mixture at nozzle 23 is ignited by igniter 24, a bimetallic swich 34 (FIGURE 4) being provided, mount- Ved in heat receiving proximity to nozzle 23 for deenergizing igniter 24 responsive to heat after ignition of the burner. The combustion llame and combustion gases are forced downward through fire pot 17 and are directed for venting from the latrine through outlet 33. During the cooling cycle, valve 32 is closed and pressurizer 27 functions to force cooling air through conduit 26, nozzle 23, fire pot 17 and to exhaust 33, thereby cooling lire pot 17. During both cycles, exhaust blower 29, also driven by motor 28, exhausts air or combustion gases through the outlet 33.

For control of air flow, including iiow of combustion gases during the burning cycle, anair flow valve member 36 is provided in the form of a large diameter tube. Valve member 36 includes a lower edge 37 having an incline parallel with the inclined surface 38 of bottom wall 12 immediately below valve member 36. Valve member 36 is also provided with a pair of ports 39 through the tubular wall thereof.

Referring now especially to FIGURES l and 3, two brackets 42 are secured to the valve member 36. Each bracket 42 includes a pair of spaced legs 42a and 42b impaled by and slidable on a rod 43. Each rod 43 is supported by a bracket 44 secured to lian-ge 16, with rods 43 upstanding on e-ach side of blower 29, valve member 36, and port 22. A compression coil spring 45 is provided on each rod 43 biasing against bracket leg 42b to normally urge bracket 42, and the valve member 36 secured thereto, upward as viewed in FIGURE 1. Thus, brackets 42, carrying valve member 36, are vertically reciprocable on rods 43 and are normally urged to a raised position by springs 45.

In order to lower valve member 36 to a restricted position with surface 37 lying against surface 38, a crank arm 46 of a lever 47 is provided in engagement with the upper surface of leg 42b between leg 42b and leg 42a of each bracket 42. Lever 47 pivots with a shaft portion thereof identified by reference numeral 48. Shaft portion 48 is rotatably secured against flange 16 by bracket 49. The shaft 52 is secured to shaft portion 48 as by way of an upstanding arm 53 on one end of shaft 52 welded to lever 47. Shaft 52 is coaxial with shaft portion 48, rotates therewith and, in effect, defines an axial extension of shaft portion 48. Shaft 52 terminates at its other end in an upstanding lever arm 54, which is pivotally connected by a pin 55 to a bifurcated end of a link 56. The other end of link 56 is pivotally connected by a pin 57 to a bifurcated end of the armature 58 of a solenoid 59. Solenoid 59 is mounted on ange 16.

The valve member 36, normally urged to an open position for permitting free ow of `air drawn by exhaust blower 29 for exhausting through outlet 33, is Ymoved to its lowered or restricting position, shown in phantom in FIGURE l, `by actuation of solenoid 59. Solenoid 59 pulls arm 58-which pivots shaft 52, via lever arm 54 and link 56, in a clockwise directon to the position shown in phantom in FIGURE l. Shaft portion 48 and crank arms 46 are also pivoted clockwise to the position shown in phantom. The crank arms 46 of lever 47 urge brackets 42 downward against the biasing of springs 45 to dispose the tubular end surface 37 of valve member 36 against surface 38, stopping flow of combustion gases into the lower end of valve member 36 and limiting flow of combustion gases to the cross-sectional area defined by ports 39. With the valve member 36 thusly moved to iiow restricting position, the ports 39 permit substantially less flow directly through lire pot 17, e.g. 5% offtotal air flow than that occurring when the valve member 36 is in its raised or open position, e.g. 100%. However, total air flow is not diminished since air is circulated across the bowl 11 above re pot 17 in the general direction of the dotted shank arrows of FIGURE 1, through gap 22a.

A space between casing 18 and insulation 14 denes an air flow chamber 60 having a plurality of air inlets which are indicated schematically at 60a and an outlet 60h so that air is drawn by pressurizer 27 and blower 29 through inlets 60a, chamber 60 and outlets 60b, partially by-passing tire pot 17 or passing through re pot 17 depending upon whether the burning or cooling cycle is in operation. A standpipe 61 opens to the outside and extends upward into the center of air valve 36 so that air is drawn directly into the central portion of valve 36 during both the burning and cooling cycles. With valve 36 in its lowered or restricted lposition, air draws across bowl 11 and by-passes fire pot 17, and air enters through standpipe 61 and is drawn through a small gap 22a, eg. 3%: inch, between the top of valve 36 and the housing of blower 29.

In the preferred form, when the valve member 36 is in the restricted position, the amount of air permittedV to flow through re pot 17 and ports 39 is only about 5% of the total amount of air which is owing through fthe system. When valve 36 is in its open position, most or all of the air flows through the re pot 17 to exhaust. As will be seen, the valve 36 is in restricted position during the burning cycle so that heat is retained in the bowl 11 permitting increase in temperature to higher severity levels within bowl 11. During the cooling cycle, the valve member 36 is moved toopen position permitting full ow of cooling air through blower 29V for exhausting of hot gases through outlet 33.

A seat member 62, having a large central port 62a defining the inlet to bowl 11, is hingedly secured to top wall 18a, top wall 18a including an inlet port registering with port 62a. A cover 63 for seat 62 is secured to a shaft 64 which is rotatably mounted through suitable mounting brackets secured to and upstanding from wall 18a. Cover 63 and shaft 64 are pivotally movable between a position with cover 63 closing inlet 62a, as shown in FIGURE l,

and a position approximately 90 clockwise from the position shown in FIGURE 1 with inlet 62a uncovered. In its closed position, cover 63 is supported, spaced slightly from seat 62, by a plurality of spacers 63a secured to the bottom face thereof and disposed to engage and rest on the upper surface of seat 62. Seat 62 may be provided with similar spacers (not shown) for spacing it from top wall 18a. The spacers 63a permit entry of air between seat 62 and cover 63 into the latrine during operation of blowers 27 and 29 for supplying blower 27 with combustion air and cooling air and blower 29 with cooling air. Generally, the same volume of air is moved through bowl 11 regardless of the position of valve 36. Thus, the owing air may be considered a generally constant volume stream circulating through the latrine with valve 36 controlling ow through the fire pot. Even when the device operates on burning cycle, air is drawn in from between the seat and cover in substantial quantities. Such operation prevents escape `of steam, smoke and gas during the burning cycle through the seat opening.

A gear and cam sector 65 is mounted on shaft 64 for rotation therewith. Sector 65 includes a gear portion 65a, a cam low 65b and a cam high 65e. A channel bracket 66 is provided secured to and upstanding from casing wall 18a. A gear 67 is in mesh with the gear portion 65a of sector 65. Gear 67 is mounted on shaft 68 which is rotatably mounted through upstanding legs of bracket 66. Gear 67 is in mesh with a timer gear 69 on timer shaft 72, also rotatably supported by bracket 66. Timer gear 69 is linked to shaft 72 for a lost motion link permitting gear 69 to rotate shaft 72 clockwise approximately 180 and to return 180 without rotating shaft 72 counterclockwise. Such a linkage is more particularly described in our copending application Ser. No. 369,057, entitled Timer Assembly for Dry Latrine or the Like, led May 21, 1964, now Patent No. 3,304,559.

As cover 63 is moved to its open position, sector 65 is rotated approixmately 90 clockwise as viewed in FIGURE l; and because the gear train from sector 65 through gear 67 to gear 69 provides a 2:1 gear ratio, gear 69 is rotated approximately 180 clockwise, carrying shaft 72 therewith. Although the timer may be capable alone of timing a greater interval than that desired, the lost motion link and gear train can be adjusted to give an amount of rotation to shaft 72 corresponding to the desired time interval. When cover 63 is again moved to its closed position, the gears reverse their rotation but shaft 72 remains in its clockwise rotated position. The rotation of timer shaft 72 clockwise 180 winds timer 73, but timer 73 is held against timing by gear 69 so long as cover 63 remains in raised position. Upon lowering seat 62, shaft 72 is free to unwind through the lost motion linkage, thereby permitting timing by timer 73.

As already indicated, timer 73 is of the type which is wound by turning a shaft and which times an interval while unwinding the shaft back to its original position. Referring particularly to FIGURE 4, a control system is provided for controlling the `actuation of the burner supply gas valve solenoid 32, the air ow control valve solenoid 59, the igniter 24 and the blower motor 28. One of the control elements of the system is the timer 73 which is a mechanism of conventional design having terminals A, B and C. The timer in its expired time position breaks the circuit between contacts A and both B and C. Timer 73 is adapted to time a total time period, e.g. twenty-one minutes, comprised of two consecutive time intervals. Upon setting the timerl to its fully set position, e.g. for timing a total time period of about twenty-one minutes, circuitry is completed from contact A to both B and C and the gas valve solenoid 32, igniter 24 and air valve solenoid 59 are energized, .as is blower motor 28, to supply fuel and air mixtures to the burner 23 and to ignite the fuel mixtures issuing from the burner nozzle. Upon ignition of the fuel mixture, the temperature-responsive bimetallic switch 34 deenergizes igniter 24, while the solenoid valve 32 remains open and the air valve 36 is held in restricted position by solenoid 59. Blower motor 28 remains energized. Upon expiration of the first time interval, predetermined by the timer 73, e.g. after expiration of fteen of the twenty-one minutes, the circuit from A to B is broken and the circuit from A to C remains completed until expiration of the remainder of the total time period constituting the second timed interval, e.g. six minutes.

Upon 'breaking the circuit from A to B, it is apparent that the supply of gas to pressurizer 27 will be discontinued and the burner will become extinguished, and solenoid 59 is deenergized permitting opening of valve 36 for full flow of air through the air exhaust system. For the second timed interval, the blower motor 28 operates to pump air by means of pressurizer 27 through conduit 26 and nozzle 23 across lire pot 17 where the air is drawn through the open valve 36 and exhausted by -blower 29 through outlet 33. Upon expiration of the second timed interval, blower motor 28 is deenergized and the air circulation ceasesDuring both burning and cooling cycles, cooling air is circulated around the mechanical linkages in the system for operating valve 36, to cool such linkages.

Still referring to FIGURE 4, a temperature-responsive override switch is provided inthe form of oating cooling cycle switch CC, mounted at exhaust blower 29, and is normally open when cold and closed when heated to a predetermined elevated overheat temperature above which t is desirable to provide or continue cooling cycle operation even after expiration of the timed cooling cycle. Closing switch CC overrides timer 23 to assure cooling cycle operation until the temperature decreases below the response temperature of switch CC.

Temperature sensitive switch BCD operates as follows: When the igniter and solenoid valve circuits are energized by circuit AB, a heater coil of a delay relay is also energized by switch' BCD. This is a normally closed switch. If, within 60 seconds, the switch does not open up, the delay relay energizes an internal solenoid which breaks contacts DE of delay relay R.

A trap door 76 is provided in bowl 11 between inlet 62a and combustion chamber 17. Trap door 76 is comprised of three generally rectangular sheets 77 of cold rolled steel or other heat-resistant material, preferably reflective, spaced from each other Vto provide an air space between each pair of sheets 77. The trap door 76 has a pair of triangular end edges 78 and rectangular side edges 79 to which the sheets 77 are secured. Sheets 77 are in contact only along one of the side edges 79. Riveted under the trap door is a piece of asbestos tape 80 which extends over the three sides of the trap door to give sealing between the trap door and hopper to prevent residual gases and smoke from coming up after shut-down. The hinged side or fourth side does not have any tape 80.

Trap door 76 is secured to a shaft 82 for pivotal movement therewith. Shaft S2 is journalled through opposing walls 13 and includes a square end 82a -beyond wall 13 received in a square opening in a crank '83. Crank 83 pivots Iwith shaft 82 and trap door 76.

A link 84, provided with length adjustment in the form of a turn buckle 84a, is pivotally secured at one end through the arm of crank 483 Iand at the other end through an arm or ange 85 projecting outwardly from one end of a lever 86. Lever 86 is in the form of a Walking beam.

Lever 86 is pivotally mounted on a pin 88 secured to a bracket 87 which is in turn secured to wall 1-8, pin 8'8 functioning as the fulcrum of lever y86. A pair of guide members l89 are also secured to wall 18 and define limits of upward and downward movement of lever 86 during pivoting thereof about pin 88 while also containing lever S6 against undue side movement.Another bracket 91 is also secured to wall 18 and mounts a normally closed 7 r limit switch 92 in disposition to be triggered to open position each time lever 86 is pivoted couuterclockwise to the position shown in phantom.

On the opposite end of lever i86 from arm v85, a follower plate 93 is provided on the top of lever 86. A plunger 94 engages plate 93 and extends through a sleeve 95 secured at its upper end to top casing -wall 18a." Plunger 94 is slidable axially through sleeve 95. The upper end of plunger 94 is provided with a disc-like follower surface 96 disposed for engagement with the low 65b and high 65C of sector 65. A spring means in the form of a tension spring 97 is provided for normally biasing trap door 76 to open position. Spring 97 is secured at one end to the arm of crank 83 and is grounded at the other end to a bracket 98 secured to casing wall 18.

In the operation of the above described linkages associated with trap door 76, it will be seen that raising cover 63 disposes the low 65b against follower surface 96, permitting plunger 9'4 to slide upward through sleeve 95. Spring 97 urges trap door 76 to the open position shown in phantom in FIGURE 2, thereby also pivoting crank 83 clockwise pulling the arm end 85 of lever 86 downward to the position shown in phantom. Plate 93 is thereby urged upward and maintains the follower surface 96 of plunger 94 against surface -65b. The limit switch 92 is opened overriding the entire burner igniter circuit in the event such circuit was energized. Movement of cover 63 to the closed position causes follower plunger 94 to be forced downward as surface 96 travels from the low 65b to the high 65C. Plunger 94 forces plate 93 downward to pivot lever 86 clockwise to its full lineV position in FIG- URE 2, thereby raising end 85 and pivoting crank `83 and trap door 76 couuterclockwise as viewed in FIGURE 2 to the full line position or closed position of t-rap door 76. Switch 92 is reclosed.

In an alternative system for controlling valve 36, referring to FIGURE 5, in lieu of the solenoid control system described above, a link 101, including an adjustable turnbuckle 101a, is pivotally connected at spaced ends to lever 86 and arm `46 to open air valve 36 each time cover 63 is raised and to close valve 36 each time cover 63 is lowered. In such alternative system, when cover 63 is raised, e.g. during use of the latrine, full ow is permitted through fire pot 17; however, while the lid is lowered, the air valve 36 is closed restricting direct flow through the lire pot as described above. Such operation results in somewhat less, e.g. of total, cooling air flow through the lire pot 17, but the unit is still satisfactory in performance, particularly 'because the other 95% of the cooling air is moved around the fire pot as described above. In

8 and the burner is ignited and supplied with fuel to initiatethe burning cycle. The timed burning cycle thenproceeds unless interrupted by raising the seat, in which case switch 92 immediately turns olf the burning cycle and provides another Ventilating cycle with only cooling cycle operation as described above.

We claim:

1. A heater or incinerator device comprising a receptacle having a support element for articles to be heated or incinerated, a burner directed at said element for heating said receptacle during a burning cycle, means for delivering fuel and combustion air through said burner during said burning cycle and for delivering cooling air through said burner and into said receptacle during a subsequent cooling cycle, an inlet to said receptacle, means defining a first flow path for directing combustion gases from said element during the burning cycle and directing cooling air from said element `during the cooling cycle, means defining a second flow path for owing gases and air from said burner through said receptacle, and flow restriction means across said iow path for restricting llow of air through said first ow path during the heating cycle to a liow rate substantially less than the flow rate through said second ow path.

2. A dry latrine or the like comprising a bowl defining a combustion chamber for receiving waste products, a burner mounted in said combustion chamber, blower means for delivering combustion air and cooling air to said combustion chamber, a ow path for `directing exhaust gases and cooling air from said combustion chamber, valve means across said ow path for regulating flow therethrough, and control means establishingy a burning cycle and a consecutive cooling cycle and controlling said burner and blower and valve means, said control means actuating said blower and burner means and moving saidk valve means to restrict ow of gases during the burning cycle for greater than normal combustion of waste products and deactivating said burner While actuating said the system using link 86, the electrical wiring may be the same with the exception of the elimination of solenoid 59. As has been seen above, each time cover 63 is moved to its open position, timer 73 is Wound but does not start timing an interval until cover 63 is relowered. With cover 63 in the open position, trap door 76 is also in its open position, the contacts A, B and C of timer 73 are all closed but the burner does not ignite because switch 92 is open.

Although the open switch 92 prevents actuation of gas valve solenoid 73 and air valve solenoid 59, thereby blocking flow of fuel to the burner and retaining air valve 36 in its full ow position, motor 28 is permitted to operate with cover 63 open. Thus, prior to the burning cycle, a venting and odor preventing cycle is provided so long as cover 63 is open, i.e., during any use of the latrine. Blower 29 and pressurizer 27 are operated by motor 2-8 to supply the Y blower and moving said valve means to permit full :flow of gases during the cooling cycle for greater than normal cooling of the bowl.

3. The device of claim 2 wherein said control means includes means establishing a blower cycle for exhausting volatiles from said bowl during deposition of waste products in said bowl and prior to the burning cycle.

4. The device of claim 2 wherein said valve means in flow restricting position is adapted to decrease flow of exhaust gases through said ow path to an amount increasing combustion chamber temperature created by said burner to a temperature suicient to burn odors in said combustion chamber.

5. The device of claim 2 including a cover for said inlet movable between open and closed positions, means reponsive to movement of said cover to -open position for actuating said control means to establish said burning and cooling cycles, and means responsive to said cover in open position for delaying the burning cycle and establishlnga cooling cycle until said cover is moved to closed positron. n

6. In a Vdry latrine having a bowl, an inlet to said bowl, a cover movable between open and closed positions for opening and closing said inlet, and a trap door mounted in said lbowl below said inlet for movement between open and closed positions, in combination therewith a crank attached to said trap door, a lever having two ends pivotal about a fulcrum therebetween, a link between the iirst end of said lever and said crank, a plunger having a first end engaging said lever at the second end of said lever, a cam driven by said cover and having a high receiving the -second end of said plunger with said cover in closed position and a low receiving the second end of said plunger with said cover in open position, and spring means urging said trap door toward open position and thereby urging said lever through said link toward a pivoted position for urging said plunger against -said`cam, said cam being driven by movement of said cover to open position to a position disposing the low of said cam toward said second end of said plunger permitting following by said plunger for enabling said spring to urge said trap door to open position and said cam being driven 4by movement of said cover to closed position to a position with the high of said cam urging said plunger to close said trap door against the urging of said spring.

7 In a heater or incinerator device, a burner, an exhaust outlet, a ow path from said burner to said exhaust outlet including a combustion chamber, a valve system in said ow path for regulating air ow through said flow path comp'rising a valve member movable between open and closed positions and having a configuration for closing said ow path when in `closed position, bypass means permitting limited ow through said flow path with said valve in closed position, a lever pivotally mounted and movable between positions for moving said valve member between open and closed positions, respectively, and means for driving said lever between said positions.

8.A The heater or incinerator device of claim 7 wherein said bypass means comprises port means through said valve member.

9. A dry latrine or the like comprising a receptacle including a combustion chamber, seat means defining an inlet to said receptacle, a cover movable between open and closed positions for opening and closing said inlet, movable heat shield means for shielding said seat means and inlet means from said combustion chamber, burner means in said combustion chamber, selective means for supplying fuel and air or air alone t-o said burner means for delivery to said combustion chamber, means forreceiving air and combustion gases from said burner means for exhausting from said combustion chamber and operable for high and low ow conditions, means for regulating said receiving means for high and low ow rates therethrough, means adjustable to a maximum timed inerval for controlling said burner, said selective supplying means and said receiving means through a timed burning cycle and a consecutive timed cooling cycle, said adjustable means actuating said selective supplying means and burner means for supplying fuel and air and for burining fuel and controlling said regulating means for low ow rate through said receiving means during the burning cycle and deactuating said burner while actuating said selective supplying means for supplying air only and controlling said Vregulating means for high flow rate therethrough during the cooling cycle, and override means responsive to movement of said cover to open position for overriding said adjustable means, blocking operation of said burner means, removing said shield from shielding said seat means, controlling said regulating means for high iiow through said receiving means, adjusting said adjustable means to maximum timed interval, and blocking said adjustable means.

10. A dry lattine or the like comprising a bowl defining a combustion chamber, an inlet to said bowl, a cover movable between open and closed positions for opening and closing said inlet, a heat shield trap door mounted in said bowl between said inlet and said combustion chamber and movable between open and closed positions, a burner mounted in said bowl below said trap door for burning material in said combustion chamber, a blower for delivering combustion air and cooling air to said combustion chamber, a ow path for directing exhaust gases from said combustion chamber, valve means across said flow path movable between open and restricted positions, said valve means in restricted position substantially restricting passage of exhaust gases through said ow path, control means including a timer adustable to a miximum timed interval for controlling said burner, said blower and said valve -means through a timed burning cycle and a consecutive timed cooling cycle, said control means actuating said blower and burner and moving said valve means to restricted position during the burning cycle and deactuating said burner while actuating said blower and moving said valve means to open position during the cooling cycle, switch means responsive to movement of said cover to open position during the burning cycle for overriding said control means and for providing cooling cycle operation of said blower and valve while de-actuating said burner, and link means responsive to movement of said cover to open position for moving said trap door toopen position and for adusting said timer to said maximum timed interval.

11. A dry latrine or the like comprisng a bowl including a combustion chamber portion and having an outlet, ow path means from said combustion chamber portion to said bowl outlet, by-pass means communicating said bowl with said outlet and by-passing said combustion chamber portion, a seat member having an opening delining an inlet to saidbowl, a cover movable between open and closed positions for opening and closing said inlet, means spacing said cover from said seat in closed position defining an air ow gap therebetween, burner means for burning material in said combustion chamber portion, air chamber means surrounding said combustion chamber portion and having an inlet and outlet, means for delivering a stream of air from said air chamber outlet and from said air flow gap through said bowl to said bowl outlet, valve means movable between positions `diverting the major amount of air flowing through said bowl selectively through said by-pass means or through said combustion chamber portion and iow path means to said bowl outlet, whereby said delivering means Vdelivers air from said gap through said bowl to said bowl outlet in each position of said valve means to inhibit escape of smoke, steam and gases from said gap, and control means establishing a burning cycle and a consecutive cooling cycle for controlling said burner means and valve means.

12. A heater or incinerator comprising a receptacle including a combustion chamber and having an inlet to said receptacle, a cover movable between open and closed positions for opening and closing said inlet, removable heat shield means for shielding said inlet means from said combustion chamber, burner means in said combustion chamber, selectively operable means for supplying fuel and air or air alone to said burner means for delivery to said combustion chamber, means for receiving and exhausting air and combustion gases from said burner means for exhausting from said combustion chamber, means for restricting said receiving means for lesser ow rates therethrough, means adustable to a maximum timed interval for controlling said burner and said fuel and air supplying means and said receiving means through -a timed heating or burning cycle and a consecutive timed cooling cycle, said adustable means actuating said fuel and air supplying means and burner means for supplying fuel and air and for burning fuel and actuating said receiving and exhausting means for exhausting gases during the burning cycle and detactuating said burner while operating said fuel and air supplying means for supplying air only and while actuating said receiving and exhausting means for exhausting air therethrough during the cooling cycle, and control means responsive to movement vof said cover to open position overriding said adustable means for blocking operating of said burner means and removing said shield from shielding said inlet means.

13. A heater or incinerator device for subjecting materials to consecutive heating or burning and cooling cycles comprising a receptacle for the materials to be heated or burned, a combustion chamber for the receptacle, a burner in the combustion chamber for heating the receptacle and materials during the heating cycle, an exhaust outlet for the combustion chamber, means for circulating air through the receptacle dun'ng both cycles including ow path means for directing combustion gases from said burner and through thecombustion chamber to the outlet, valve means in said ow path for restricting flow from the combustion chamber portion of the flow path to the outlet to a low rate of flow constituting a minor proportion of the total iiow through the remainder of said receptacle, said valve means being movable to a low rate of ow position for providing the low ow rate and to a high rate of flow position for providing the total flow, means dening a bypass ow path from the receptacle to said outlet for bypassing said valve means and for accommodating the remaining major proportion of said total How, and control means for establishing the heating and cooling cycles, for actuating said burner and for controlling said valve means to the low rate of ow -position during the heating cycle and for deactuating said burner and controlling said valve means to the high rate of flow position during said cooling cycle.

14. The device of claim 13 including an inlet for said receptacle, a cover for said inlet movable between open and closed positions and means responsive to movement of said cover to open position during the heating cycle for overriding said control means to cancel the heating cycle,

deactuating said burner and controlling said valve means Y,

said combustion chamber, means establishing a burning cy- Y cle and subsequent cooling cycle for actuating said burner means during said burning cycle and deactuating said burner means during said cooling cycle, means for increasing air flow through said combustion chamber for cooling said combustion chamber, and temperature responsive means for cancelling the burning cycle at a predetermined elevated temperature level including time delay means for delaying stopping of the burning -cycle during a predetermined time interval and for blocking the cancelling of the burning cycle responsive to decrease in temperature below said level during said time interval.

17. A dry latrine or the like comprising a bowl having a combustion chamber, a seat member having an opening defining an inlet to said bowl, a cover for opening and closing said inlet, burner means for burning material in said combustion chamber, timer means establishing a burning cycle and a consecutive cooling cycle for actuating said burner during said burning cycle and deactuating said burner during the cooling cycle, means for flowing air through said bowl and combustion chamber, and valve means in an outlet to the combustion chamber responsive to said establishing means for increasing the amount of air lilow through said combustion chamber during the cooling cycle.

18. The dry latrine of claim 17 wherein said flowing means comprises an exhaust blower for exhausting gases from the bowl and including exhaust conduit means extending from said combustion chamber outlet to said exhaust blower, and a second separate conduit means bypassing said exhaust conduit and extending from a position in said bowl above said combustion chamber to said exhaust blower for bypassing the exhaust conduit and valve means, said valve means comrises means for divertin-g the major amount of total air flowing through the bowl into said bypass conduit while permitting a minor amount of the total air to flow through said combustion chamber and exhaust conduit to the exhaust blower.

19. The dry latrine of claim 17 including temperature responsive means for cancelling the burning cycle at a predetermined elevated temperature.

20. The dry latrine of claim y17 including heat shield means disposed between said combustion chamber and said inlet and comprising a plurality of continguous and co-extensive facing sheets of heat reflective, heat resistant material capable of resisting temperatures of up to 1400 F. separated by and generally enclosing air pocket means between each facing pair of said sheets, and means mounting said heat shield means for movement between open and closed positions.

21. The dry latrine of claim 17 including a trap door in the bowl between the inlet and the combustion chamber mounted for movement between a closed position and an open position, transmission means for moving said trap door, and wherein said establishing means comprises movable timer and control means for actuating said burner to burn during the burning cycle, said dry latrine further including transmission means for moving said timer means, a common means driven by said cover for driving both of said transmission means, and separate means responsive to driving said common means and said transmission means lby said cover for deactuating said 'burner'.

22. The dry latrine of claim 17 including means separate from said establishing means and operable responsive to movement of said cover to open position during the burning cycle for overriding the establishing means to cancel the burning cycle.

23. The device of claim 22 wherein said override means is adapted to directly control said burner means and to provide cooling cycle operation of said cooling means and render said burning temperature establishing means inactive.

24. An incinerator device for subjecting materials to consecutive burning and cooling cycles, comprising a receptacle for the materials to be burned including a combustion chamber in the receptacle, a burner in the forward portion of the combustion chamber for burning the materials during the burning cycle, means for circulating air through the receptacle during both cycles including an exhaust blower, an exhaust outlet in the rear portion of the device for passing gases received from the combustion chamber into the exhaust blower, an exhaust conduit beginning at the rear portion of the `combustion chamber for directing combustion gases from the combustion chamber to the exhaust blower, means at said exhaust conduit restricting flow through the exhaust conduit from a lower portion of the combustion chamber to the outlet to a low flow rate constituting a minor proportion of the total ow through the remainder of said receptacle, and means deiining a bypass ow path at least partially openly exposed to and above said lower portion and separate from said exhaust conduit for bypassing said restricting means for accommodating a remaining proportion of said total flow to said outlet.

25. The device of claim 24 wherein said restricting means comprises manually operable means and means responsive to said manually operable means for maintaining the less than total ow rate through said combustion chamber during both cycles.

References Cited l UNITED STATES PATENTS 1,706,959 3/ 1929 Finnel et al. 12-8-285 1,71 1,3 65 4/ 1929 Summers.

1,995,039 3/ 1935 Pickup 126-190 2,165,488 7/1939 Klimis 236-1 2,882,534 4/1959 Jauch et al 110-9'3 X 3,092,049 6/ 1963 Wood 110-9 3,103,017 9/1963 La Mere 110-9 X 3,189,020 6/ 1965 Getman 126-190 FREDERICK L. MATTESON, .l R., Primary Examiner.

H. B. RAMEY, Assistant Examiner. 

24. AN INCINERATOR DEVICE FOR SUBJECTING MATERIALS TO CONSECUTIVE BURNING AND COOLING CYCLES, COMPRISING A RECEPTACLE FOR THE MATERIALS TO BE BURNED INCLUDING A COMBUSTION CHAMBER IN THE RECEPTACLE, A BURNER IN THE FORWARD PORTION OF THE COMBUSTION CHAMBER FOR BURNING THE MATERIALS DURING THE BURNING CYCLE, MEANS FOR CIRCULATING AIR THROUGH THE RECEPTACLE DURING BOTH CYCLES INCLUDING AN EXHAUST BLOWER, AN EXHAUST OUTLET IN THE REAR PORTION OF THE DEVICE FOR PASSING GASES RECEIVED FROM THE COMBUSTION CHAMBER INTO THE EXHAUST BLOWER, AN EXHAUST CONDUIT BEGINNING AT THE REAR PORTION OF THE COMBUSTION CHAMBER FOR DIRECTING COBUSTION GASES FROM THE COMBUSTION CHAMBER TO THE EXHAUST BLOWER, MEANS AT SAID EXHAUST CONDUIT RESTRICTING FLOW THROUGH THE EXHAUST CONDUIT FROM A LOWER PORTION OF THE COMBUSTION CHAMBER TO THE OUTLET TO A LOW FLOW RATE CONSTITUTING A MINOR PROPORTION OF THE TOTAL FLOW THROUGH THE REMAINDER OF SAID RECEPTACLE, AND MEANS DEFINING A BYPASS FLOW PATH AT LEAST PARTIALLY OPENLY EXPOSED TO AND ABOVE SAID LOWER PORTION AND SEPARATE FROM SAID EXHAUST CONDUIT FOR BYPASSING SAID RESTRICTING MEAN FOR ACCOMMODATING A REMAINING PROPORTION OF SAID TOTAL FLOW TO SAID OUTLET. 